Patch unlocks TV's ability to passthrough 5.1 audio from HDMI to SPDIF (optical). However, it's first mandatory to "fake EDID", else no point in trying patch. For this several possibilities (non-exhaustive list):

Most cheap HDMI switches have generic EDID, and inserting one between HDMI device and TV does the job.
Otherwise, more expensive devices are meant to, and specifically do it (EDID Manager, Dr HDMI...)

If HDMI device is Windows PC, EDID can be easily overrided by modifying monitor.inf or regedit (search forum and/or Google for EDID hack/fake/override to find how-to).

PS3 has its own built-in "override EDID" option.

Some (most?) Android media player devices don't care at all of TV's EDID, so it should work with them too.

More generally for patch to work, you have to find state where you can select "Dolby Digital" as SPDIF mode in TV menu while being on HDMI source, but TV outputs no sound at all.

Some TVs already have AC3 compliant EDID, no idea which ones but they exist, only way to know is to try.

AUTO - Will automatically switch to AC3/DTS SPDIF out mode on HDMI source

PCM - Forcibly returns to PCM mode when switching back to TV source

DTS(experimental) - Allow both AC3 and DTS to passthrough. In this mode, TV will always show all SPDIF output modes "available" on all sources (even if they're not). If HDMI source outputs DTS, selecting DD or DTS should switch to passthrough even if TV reports PCM.

hi, so far without patch i have this results:
i get sound from receiver via samsung tv optical as DTS, DOlby Digital, PCM sound format (depend on movie codec)
for tv channels also i have some sound options, depends on ch.
from smarthub, and aux hdmi sources i get only PCM. If i have ARC on both side i suppose i will get more sound formats.

If i understood right, i will get from set top box via hdmi, dolby digital format on tv, nevertheless arc support?

for patch to work, you have to find state where you can select "Dolby Digital" as SPDIF mode in TV menu while being on HDMI source, but TV outputs no sound at all.

As long as this condition is not fullfilled, no point in trying patch, and no matter which output type you select on your STB, TV will request PCM, so HDMI device will send PCM. That's how EDID handshake goes and that's why it's needed to override it using one of mentioned methods (non-exhaustive list, particular devices might be unknown to me).

Hi zoelechat - I was going to test your patch on my F-series and I was checking that your precondition was ok. I hooked my motorola cable box directly to HDMI1 and it has 3 audio settings, AUTO, L-PCM, and PASSTHROUGH. I set it on PASSTHROUGH figuring that would override any EDID setting and indeed DOLBY Digital is available in the sound menu. The strange thing is optical out is sending 5.1 to my receiver no problem, how can this be? I thought HDCP would prevent the TV from decoding it (and hence a need for the patch).

Ah ok, too bad, I was happy that finally someone could report something on F/H
From what I know, it seems the "value" which is patched is sometimes (rarely) enabled (at least: not disabled) by default on some TVs. The same goes for some other features we've randomly discovered. Why? Absolutely no idea

Ok, thanks for the reply. My previous D-series behaved the same way. On the F-series there is also a setting in the service menu HDCP enable (on/off) and I tried in both positions but it made no difference. Sorry I couldn't be more help.

I can report that it's working on H series. (more specifically on UE40H6400, T-MST14DEUC-2130.0)

I have a settopbox connected to the tv via hdmi. The tv is connected to my sound system through optical spdif. About 100 tv channels gave sound, but 5 didn't...
In the sound settings, it's still on PCM mode. But there is now sound on the 5 channels which gave problems before.

Thanks a lot for this patch! Just what I needed

PS: I didn't do anything with EDID, just installed the patch and there was sound